Patent US2129980A successfully refreshed from Google Patents.
Patent US2646781A successfully refreshed from Google Patents.
US2646781A
Expired / Lapsed
US
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Vacuum spark control
Assignee: Individual
•
Filing: 1951-02-08
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Granted: 1953-07-28
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Expires: 1971-02-08
Abstract
No abstract record available.
Inventors
- 👤 Juan A Doyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:46
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103; F02P5/106; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2144; Y10T74/2147; Y10T74/2151
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2233035A
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US2389412A
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US2333401A
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US2450535A
Cited
US2354472A
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US2485186A
Cited
US2477233A
Cited
US2489419A
Cited
GB617638A
Cited
US2493180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |